Questions tagged [ecc]

ECC stands for Elliptic Curve Cryptography. Elliptic curves are a mathematical structure which allow to define cryptographic operations on them.

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What is the relation between cipher suite and certificate? [duplicate]

I generated my self signed certificate using openssl and I chose ECC keys (prime 256v1) for root certificate but while authenticating with the server i.e. IBM cloud and my device the negotiated cipher ...
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GnuPG: Why is my Ed25519 signature 144 bytes long rather than 64?

according to https://tools.ietf.org/html/rfc8032 EdDSA uses small public keys (32 or 57 bytes) and signatures (64 or 114 bytes) for Ed25519 and Ed448, respectively; But if I sign using Ed25519 in ...
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How to generate a X509 certificate with an EC public key and RSA signature using OpenSSL?

I'm trying to generate a X509 certificate with an EC public key but an RSA signature. I'm using OpenSSL like this: openssl genpkey -algorithm EC -out ec256key.pem -pkeyopt ec_paramgen_curve:P-256 -...
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MiTM attack on a Tor V3 Onion Service?

As far as I understand it, the address of a v3 onion service is simply an ed25519 public key itself. Assuming the end user actually managed to acquire the legitimate 56 character .onion address (i.e. ...
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Is using only secp384r1 and up named groups considered okay?

I found that secp384r1 is supported in almost all web browsers and it is considered secure. My question is: Is it okay if i use only secp384r1 and up named groups? Are there any disadvantages ...
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How to securely design REST API for Password Manager app?

I want to create Password Manager where users can create their accounts and store website passwords. For the frontend, it will be a mobile app, but I need REST API as the backend data where the data ...
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1answer
119 views

Can a client with an ECC certificate and a server with RSA certificate establish a mTLS connection?

Can a client with an ECC certificate and a server with RSA certificate establish a mTLS connection? Can they agree on a cipher suite? Why?
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Signing CSR using an ECC keypair

I'm trying to sign a CSR using python-asn1crypto and python-pkcs11. I have an ECC Keypair stored in a Hardware Security Module (HSM). Here's a code sample: key = decode_ec_public_key(...
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Should I re-timestamp old timestamps when switching to a stronger algorithm?

One of our clients uses a trusted timestamp service to prove that certain documents existed on the day they were created (they don't need a full digital signature, just the timestamp). The server uses ...
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300 views

Algorithm and key size to choose for SSL certificates (security and CPU wise) in 2020 (using nginx)

I posted this question already on SO, but as it is not really a programmin question I thought it might be a better place to ask here: I want to setup a new SSL certificate store for generating SSL ...
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Why does TLS1.3 use same cipher suite for RSA and ECC key pairs?

As per this answer RSA and ECC certificates should use different cipher suites. I tried to test it. It holds true for TLSv1.2. But for TLSv1.3 I see same cipher suite being used for both types of ...
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gpg key size of 4096 and “the future is ECC”

My boss wants to sign our binary. I need to tell him how he can create the signing key. Most if not all sites I have seen about signing binaries say "use gpg". OK, so gpg per default has 2048. Their ...
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PKCS12 generation for ECC key types using JavaScript

I'm generating p12 for ECC key types using the Forge library. https://github.com/digitalbazaar/forge/issues/777 This library already provides p12 for RSA key types; now, I'm trying to enhance to ECC ...
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Why don't folks seem to use ECC for TLS root certificate signature?

I looked around, and all I see is websites using RSA2048 for Root signature, and a few using ECC for encryption. Are there any reasons folks don't seem to use ECC for TLS root signature? Are there ...
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Does the “Key Encipherment” key usage make sense when using ECDH P384?

I configured a Windows CA and created a certificate template to issue certificates with ECDH_P384 keys: Then I noticed that it's not possible to set the "Key Encipherment" key usage in the "...
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How does CVE-2020-0601 (ChainOfFools/CurveBall) work to undermine ECC?

What is the recently patched and disclosed Windows 10 OS family Crypt.dll vulnerability CVE-2020-0601, nicknamed ChainOfFools and/or Curveball? I've read up on it and while I understand the basics (...
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SSH and the ECDH component

With SSH, most of my servers use ed25519 (the twisted Edwards variant EC) for authentication. I was wondering, after authentication with ed25519, does SSH protocol 2 simple use ephemeral/ephemeral ...
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Does a TLS client needs to support one of the named groups (curves?) supported by the server for TLS handshake to succeed?

Does a TLS client needs to support one of the named groups (curves?) supported by the server for TLS handshake to succeed? Longer version: I'm running a web site using Windows Server 2016. The web ...
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Attack on RSA and ECC

I am reading information about RSA and Eliptic Curves cryptography. Assuming that both these two algorithms have stages until two parts achieve key exchange. If an attacker eavesdrop the stages before ...
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Is it important to use separate GPG keys for signing Git commits and for SSH authentication?

When using GPG to sign Git commits, and as the SSH-agent, is it important to use separate sub-keys for the signing of the Git commits as it is for authentication with the SSH host of the Git server? ...
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1answer
101 views

Is this key exchange algorithm secure and valid? [closed]

I'm writing reliable UDP implementation and I want it to be secure. Also, I want to make use of elliptic curve cryptography. I don't have the proper education to really understand the math behind this ...
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How can I add bits of security? (e.g. RSA + ECC)

If we have an RSA layer of encryption over some text with n bits of security, then we use an elliptic curve, say with m bits of security, how can we calculate the total bits of security with RSA(ECC(.....
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How does MariaDB's ed25519 auth scheme work?

Newer versions of MariaDB (a MySQL database server fork) have a new password based auth scheme called "ed25519". The docs are very sparse regarding how it works and what it does. https://mariadb.com/...
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ECDHE_RSA_WITH_AES_128_GCM_SHA256 - How to determine ECDHE Key Length?

Server: SSL Certificate, 2048-bit RSA Public Key, Signature Algorithm is sha256RSA What am I missing here? ! I've scoured the RFC's, and I have yet to find anything on how to determine the ECDHE key ...
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secp256k1 GPG key?

Given that secp256k1 is used to underpin the entire Bitcoin network (worth $174B as of today) -- it appears to offer demonstrably better security than other EC curves as no one has yet taken the ...
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CSR signature using elliptic curve

We've been asked to generate certificate signing request using elliptic curve and we can't use any third-party library it's an embedded application with very limited resources). We are used to ...
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999 views

GPG unattended ECC key and subkey generation

I want to generate an ECC key where the primary key is just for cert and has 3 subkeys for auth, sign, encrypt. I've found 2 methods to generate it. But I want to use unattended key generation via ...
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Elliptic Curve searchable encryption for message delivery

I need a simple message scheme where a sender can send a private message to a receiver using a public database and without relieving who the receiver. All parties have an Elliptic Curve public and ...
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639 views

Converting a raw EC public key into EVP_PKEY using openssl

I am trying to convert a raw EC key and EVP_PKEY structure. The process seems straightforward but am running into issues. Here is the code I am using -- unsigned char tmpPubKey[] = { 0x04, ...
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OpenSSL ECC key - Additional byte in DER encoding for one curve

In the below, I use OpenSSL to create a private key for the secp224k1 curve. Note the length of the private key in the DER - 0x1d. That's 29 bytes, or 232 bits, not 224. It appears that a leading zero ...
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RSA 4096 vs. ECC Curve 25519

I want to use GPG to encrypt files before storing them as backup in the cloud. I don't care about interoperability or performance/resource consumption during encryption/decription. I only care about ...
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Which encryption algorithm for cloud backup?

I want to backup my data to the cloud. Before that, I want to encrypt it using GPG (gpg (GnuPG) 2.2.11 and libgcrypt 1.8.4). The backup is just for me, so I don't care about interoperability I only ...
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301 views

AES, RSA, ECC Key size [closed]

It is generally said that 2048-bit RSA keys are roughly equivalent to 112-bit symmetric keys and 2048-bit RSA keys are "sufficient for commercial use until around the year 2030" (https://security....
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Shareable encrypted data in a web application

This is a follow up on my previous question about Storing sensitive, sharable data for a company where several of the employees have access to the server. This solution has worked well for our ...
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1answer
708 views

ECDH and static key encryption

It's been a while and I'm still trying to figure out if my understanding of ECC crypto is correct. Basically from what I understood a purely asymmetric encryption is never used. Usually the ...
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567 views

How can I use 'safe' Elliptic Curve algorithms in .Net Core?

I'm looking to build my own digital signature operations into a program I'm writing, and the nuances of cryptography are a bit beyond me. According to this website the NIST/NSA algorithms (P-224, P-...
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427 views

BouncyCastle and Microsoft Cng ECDH secret key mismatch

I'm trying to refactor some client-side code from BouncyCastle to Microsoft Cng. I've figured out how to convert key format(ECC key blobs) between them, but I couldn't calculate the same secret. ...
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Advantage Of ECDH-RSA over RSA Ciphersuites In TLS

If ECDH-RSA is used for key exchange, this is what happens: The server has its public ECDH parameter embedded within its certificate. The client generates its public ECDH parameter, extracts the ...
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Why PEM encodings of EC public and private keys use different headers?

Manual page for OpenSSL ec command states: The PEM private key format uses the header and footer lines: -----BEGIN EC PRIVATE KEY----- -----END EC PRIVATE KEY----- The PEM public key ...
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Is the JDK standard EC KeyPairGenerator suitable for use with both ECDSA and ECDH algorithms?

I've seen various references on the web for generating Elliptic Curve KeyPairs in Java, and the two most commonly referenced examples (unsurprisingly) use the JDK default provider and BouncyCastle. ...
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368 views

Can be used ECDH with static public key and parameters?

I have protocol required for privacy. Thus, I want to use hybrid cryptography. Base on my knowledge, ECDH is fast and secure. My system consists of 3 main components a trusted-server, client, and ...
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846 views

ASN.1 encoding of X25519 private key

I'm using mbed TLS for ECDH key agreement using Curve25519. The private and public keys are stored and transmitted as Hex strings as easily generated with mbed TLS. Those strings are big-endian. This ...
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Where can I find a canonical list of elliptic curve names and their aliases?

I recently had a problem where I created an EC client certificate which used the sect571k1 curve and I got some strange errors attempting to use it as a client certificate through Mozilla Firefox. It ...
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What is the format of an X9.62 key?

RFC8292 contains this gem: The "k" parameter includes an ECDSA public key [FIPS186] in uncompressed form [X9.62] that is encoded using base64url encoding [RFC7515]. There is an example of the use of ...
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What can you do with a sufficiently complex quantum computer against Elliptic Curve Cryptography?

I've heard that a modified version of Shor's algorithm can "break" ECC. But what does this mean specifically? What are all the things you can do with this algorithm? Can you: decrypt messages ...
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Does using the same curve certificate on both ends cause security issues?

I have the following scenario: an application that establishes a full mesh connection with itself on a remote server. We use 0MQ and curve certificates for security and authentication, but at the same ...
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Is it safe for both client and server to use the same keypair in CurveZMQ?

I make software for physics labs, and computers in the labs are exchanging all sorts of information with each other and with researcher's laptops, usually on a university network. I use ZeroMQ for ...
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Does the ECDSA signature value (of an OCSP response) need to be DER encoded

In OCSP responses by a certain eIDAS PKI I every once in a while get signature values which, when unpacked from their BIT STRING, contain an ECDSA signature whose INTEGER constituents have an ...
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Generate new key - ECC vs RSA

I intend to start using GnuPG again. I haven't used it for the last 2 years and was surprised that there is now the option for RSA and ECC keys. After reading a bit about ECC, it seems to me there is ...
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Is There a Whitepaper or Explanation of ECDSA somewhere? [closed]

Let's say I wanted to write an implementation of ECDSA from scratch to better understand it. I can't find a raw, non-abstract explanation anywhere. I tried tracking down the sources on the wiki ...